What are tachyons? What is known about them? What are possible future uses do they have for humans?
There have been suggestions regarding using their “faster than light” capability for the “warp drive” travel beloved of SF novels, but this page also mentions aspirations to try to use tachyons for high-speed communications.
tachyons are FTL particles with imaginery rest mass that are allowed by relativity, they’ve never been detected and in all probailty don’t exist.